Rename One File In Batch To It's Modified Date

[Climate Hillbilly Davis]

Need to rename one file in batch to it's created date, i.e.,
"latest.gho" > "createddate.gho"

Format example: "01-04-2018.gho"

Just one file, not a group.

I use this to rename it to current date: if exist D:\Latest.gho for /f
"tokens=1-5 delims=/ " %%d in ("%date%") do rename "D:\Latest.gho" %%e-%%
f-%%g_C.gho

Thanks.

[JJ]

Use this. Pass the file as the first parameter.

@echo off
setlocal enabledelayedexpansion
if not exist %1 goto :eof
for %%F in ("%~1") do (
set d=%%~tF
ren "%%F" !d:~0,2!-!d:~3,2!-!d:~6,4!%%~xF
)

[Climate Hillbilly Davis]

On Sat, 6 Jan 2018 21:15:09 +0700, JJ says...

Perfect... thank you very much!

I can't TELL you how many people on the net have written similar batch
files, but took about 500 more characters to do so, and STILL didn't work
right.

Thanks again.

[Grant Taylor]

On 01/06/2018 08:01 PM, Climate Hillbilly Davis wrote:
> I can't TELL you how many people on the net have written similar batch
> files, but took about 500 more characters to do so, and STILL didn't work
> right.

If you're trying to save as many bytes as possible, try this:

@setlocal enabledelayedexpansion
@if exist %1 for %%F in ("%~1") do @(
@set d=%%~tF
@ren "%%F" !d:~0,2!-!d:~3,2!-!d:~6,4!%%~xF)

You save multiple characters by not using @ECHO OFF and instead putting
the @ character in front of commands that would otherwise show up on the
screen. - There's simply fewer commands than the bytes in the "@ECHO
OFF" string.

I also question the lack of (double) quotes around %1 in the if
statement. I guess it's fairly safe to not have them in the new name of
the ren(ame) command. Unless the extension has a space in it. }:-)



--
Grant. . . .
unix || die

[Climate Hillbilly Davis]

On Sat, 6 Jan 2018 21:31:03 -0700, Grant Taylor says...

>
> On 01/06/2018 08:01 PM, Climate Hillbilly Davis wrote:
> > I can't TELL you how many people on the net have written similar batch
> > files, but took about 500 more characters to do so, and STILL didn't work
> > right.
>
> If you're trying to save as many bytes as possible, try this:

It's not a deal at all. The batch file is small to begin with.

I've got @echo off, spaces and cls's and moves and program starts, and
it's only 494 bytes.

> @setlocal enabledelayedexpansion
> @if exist %1 for %%F in ("%~1") do @(
> @set d=%%~tF
> @ren "%%F" !d:~0,2!-!d:~3,2!-!d:~6,4!%%~xF)

That worked fine too. Thanks.

> You save multiple characters by not using @ECHO OFF and instead putting
> the @ character in front of commands that would otherwise show up on the
> screen. - There's simply fewer commands than the bytes in the "@ECHO
> OFF" string.
>
> I also question the lack of (double) quotes around %1 in the if
> statement. I guess it's fairly safe to not have them in the new name of
> the ren(ame) command. Unless the extension has a space in it. }:-)

No space in the extension, so all is well.

I'm not sending a parameter, so I just changed the %1 to the name of the
file that I produce later in the batch file.

One question, though... what is the %~1? I also put the name of the file
there and it still works. What is the difference in %1 and %~1?

Thanks again.

[Grant Taylor]

On 01/06/2018 09:45 PM, Climate Hillbilly Davis wrote:
> It's not a deal at all. The batch file is small to begin with.

*nod* That's what I figured. But based on your previous comment,
"…took about 500 more characters…" I thought you might be trying to be
as small as possible.

> I've got @echo off, spaces and cls's and moves and program starts,
> and it's only 494 bytes.

Based on my tests (that I've since removed) I think I was coming in at
~127 B compared to 158 B. So, a non-trivial percentage, …if you are
chasing every byte possible. ;-)

> That worked fine too. Thanks.

You're welcome.

> No space in the extension, so all is well.

*nod*

> I'm not sending a parameter, so I just changed the %1 to the name of
> the file that I produce later in the batch file.

You might be able to refactor things to remove the conditional and just
call the for loop directly.

> One question, though... what is the %~1? I also put the name of the file
> there and it still works. What is the difference in %1 and %~1?

Based on a quick skim of the output of "for /?", it looks like the tilde
without any letter between it and the variable name removes surrounding
quotes.

So I think the idea is to remove the quotes if they exist, and to
manually put them there. Thus avoiding a double quoting issue.

> Thanks again.

You're welcome.